diff --git a/thunderbird.xml b/thunderbird.xml
index a9a5e3df5d5512aa895eaf0e0e3d8f4223f17d87..fedf1e31deb48528bd663e507aa85a3b64c305ea 100755
--- a/thunderbird.xml
+++ b/thunderbird.xml
@@ -7,7 +7,7 @@
 			 we add in chemistry-prefs.js. Thus, we tie that to a version, and please test carefully when
        upgrading -->
 
- <variable name="version" value="38.3.0" />  
+ <variable name="version" value="38.4.0" />  
  <variable name="prefsversion" value="38" />
  <check type="uninstall" condition="exists" path="Mozilla Thunderbird %version%.*" />